code: def test_positive_semidefinite_periodic(
      base_class: Type[kernels.IsotropicStationary],
  ) -> None:
      """
      A valid kernel is positive semidefinite. Some kernels are only valid for
      particular input shapes, see https://github.com/GPflow/GPflow/issues/1328
      """
      kernel = kernels.Periodic(base_class())
      pos_semidefinite(kernel)
  
file_path: GPflow/tests/gpflow/kernels/test_positive_semidefinite.py
imports: from typing import Type
  import numpy
  import pytest
  import tensorflow
  from numpy.testing import assert_array_less
  import gpflow.ci_utils
  from gpflow import kernels
label_desc: Use image node_id 3 for calling a global function with example usage: test_positive_semidefinite_periodic(base_class) without return types